Publication Date

1982

Document Type

Dissertation/Thesis

First Advisor

McAllister, Wallace R.||McAllister, Dorothy E.

Degree Name

M.A. (Master of Arts)

Department

Department of Psychology

LCSH

Fear||Extinction (Psychology)||Association of ideas||Conditioned response

Abstract

It has been demonstrated that the presentation of an unconditioned stimulus (UCS) will result in an increment in the level of responding to an extinguished conditioned stimulus (CS) which had previously been paired with the UCS. Possible explanations for this reinstatement phenomenon have implicated either associative or nonassociative mechanisms. The nonasso- ciative interpretation holds that reinstatement results from an increase in the representation of the UCS that had been devalued during extinction. The associative model assumes that reinstatement is the product of the reconditioning of the conditioned response (CR) to the stimuli present at the time of the UCS presentation. In this study, 112 rats received handling and exploration of a hurdle-jumping apparatus on Day 1. On Day 2, five groups received 25 trials in which fear was conditioned to the stimuli of one compartment of the hurdle-jumping apparatus (white box with grid floor) followed by the extinction of fear to those apparatus cues. Two other groups spent an equal amount of time during these periods in a neutral box. Shock presentations were then administered in either the testing context (hurdlejumping apparatus), the testing context in darkness (no visual cues), or in a distinctly different context (small, solid-floor box), in an attempt to reinstate the extinguished fear response. On Day 3, the amount of fear elicited by the situational cues of the hurdle-jumping apparatus was measured by the learning of an escape-from-fear task. The results clearly support an associative reconditioning model. Reinstatement was obtained only when some further conditioning of the CR (fear) to the CS took place. Groups given UCS presentations in the solid-floor box showed no evidence of reinstated fear, therefore providing data contrary to a non- associative model of reinstatement. When reinstatement shocks were presented in darkness, subjects performed as well as those given the shocks, in the original context. This finding demonstrates the dominance of the tactual over the visual cues in the reinstatement situation.

Comments

Includes bibliographical references.||Includes illustrations.

Extent

vii, 51 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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